Yieldable pneumatic thread remover for looms



p 1951 A. c. KRUKONIS 2,556,339

YIELDABLE PNEUMATIC THREAD REMOVER FOR LOOMS Filed March 25, 1950 INVENTOR ALEXANDER G. KRUKONIS QMI/TM ATTORNEY Patented Sept. 4, 1951 YIELDABLE PNEUMATIC THREAD REMOVEB FOR LOOMS Alexander C. Krukonis, Auburn, Mass... assignor to Crompton & Knowles Loom Works, Worcester, Mala, a corporation of Massachusetts Application Marches, 1950, Serial No. 151,857

6 Claims. (01. 139-256) This invention relates to improvements in pneumatic thread removers for looms and it is the general object of the invention to provide a mounting for the remover which will permit it to yield to avoid damage if the shuttle is not properly boxed.

It has been proposed heretofore to mount a pneumatic thread remover adjacent to the reserve bobbin magazine of a weft replenishing loom and move it to thread pick-up position incident to a bobbin changing operation. Such removers are ordinarily in raised position and are depressed by a stud extending laterally from the transferrer arm, and if a shuttle is widely misplaced transfer will be revoked and the thread remover will remain in raised position. In some instances however where the shuttle is only slightly misplaced, the mechanism which is intended to revoke a transfer fails to operate and the thread remover is forced down against the end of the shuttle which protrudes from the shuttle box with resultant damage to both the shuttle and the remover.

It is an important object of the present invention to provide a thread remover which is held yieldingly on a carrier so that as the latter rocks under the action of the transferrer arm the remover can move upwardly with respect to the carrier if it engages the shuttle. The remover is conveniently held in a normal down position with respect to the carrier by resilient means such as a spring and will move with the carrier without relative movement with respect thereto on all normal replenishing operations.

If the carrier, stud on the transferrer arm, and the remover are so related that the latter is likely to be forced downwardly too far so that it strikes the lay the yielding connection between the carrier and the remover will permit a slight upward relative motion of the latter so that it will not be damaged when engaging the lay.

It is a more specific object of the invention to provide the carrier with a vertical guide slot through which the remover tube extends and in which it can have relative guided vertical motions with respect to the carrier. The forward end of the remover is preferably mounted for angular motion with respect to the carrier and the remover tube can slide forwardly relative to the carrier and its pivotal connection in the event that it is struck by a misplaced shuttle as the lay moves forwardly.

With these and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of the invention is set forth, Fig. 1 is a side elevation of one form of weft replenishing mechanism having the invention applied thereto, the lay, shuttle box, shuttle and part of the loom frame being shown in cross section,

Fig. 2 is an enlarged plan view looking in the direction of arrow 2, Fig. 1,

Fig. 3 is a detailed vertical transverse cross section on line 3-3, Fig. 2, showing that part of the carrier which provides a vertical guide for the remover tube,

Fig. 4 is an enlarged vertical transverse section on line 4-4, Fig. 2, showing the pivotal mounting for the forward end of the thread remover tube,

Fig. 5 is a reduced vertical section on line 5-5, Fig. 4, and

Figs. 6 and 7 are diagrammatic views showin two types of yielding of the remover when it engages a misplaced shuttle.

Referring particularly to Fig. 1, the loom frame ID has mounted thereon a support I I provided with a pivot pin or stud I2 on which a reserve bobbin magazine M is mounted. The magazine as set forth herein is of the type which carries two stacks of reserve bobbins (not shown) and is rocked so that the lowest bobbin in one or the other of the stacks will be in transfer position. Ordinarily the magazine is at rest and transfer from one stack will occur without rocking of the magazine, but transfer from the other stack requires a slight angular motion of the magazine.

The support H carries a transferrer stud I5 on which the transferrer arm I6 is pivoted. This arm is of usual construction and has extending laterally therefrom an operating stud I! which overhangs a finger 18 forming part of a carrier designated generally at C. This carrier is mounted for angular motion on the stud l5 and a friction plate [9 is held against it by a flat.

spring 20 engaging a nut 2| on the stud IS. The spring and washer hold the flat body 22 of a carrier C against a hub 23 which may be formed as 25 which engages a tranferrer latch :26 normally in the down position shown in Fig. 1. By

means not set forth herein but well understood this latch will be raised into the path of the advancing bunter 25 as the lay moves toward front center position on a weft replenishing beat of the loom and it is in this manner that the trans- .ferrer arm I6 is moved in a counter-clockwise direction around stud I5, Fig. 1 to perform its bobbin transferring operation.

As the transferrer arm descends its stud l1 engages the finger [8 to rock the carrier C from.

the normal non-pick-up position shown in Fig. '1 to a pick-up position such 9. S;;SILQWn;'fQ1';iIlS%QQe in Fig. 7. At a later time a rod 21 rises to engage a wing 28 on the carrier to restorethe latter to its normal position after ,theLtransf errerarm has returned to its normal raised, position.

A revoker arm, an example of which is'shown at 29, is ordinarily employed "todetect whether.

ly misplaced the'revoker'mechan-ism can-be relied upon "the prevent transfer, but it the shuttle is only slightly 'misplaced therevoker mechanism may not always operate with the-result that the transferrer arm will descend while the shuttle is protruding from the box- B.

It is to be understood thatthe typeof-repleni'shing mechanism shown in -Fig. =1-is-set forth merely-for the purposeofillustratlng the invention and that the matter -to-be described hereinafter is not limited in its use-to-the form of magazine M-or the typeof-revoker arm-29 shown. Except" asotherwise-noted hereinafter the -matter thus far described-'is-of' common construction.

In carrying the invention into effect-there is provided a pneumaticthreadremover designated generally at R including a rigid elongated-member,such as tube 35; to the rear end-ofwhich,

the-leftas viewed in=-Fig. 1,--is secureda thread deflector or bafiie platetfi fastened-- at its: rear edge to a pneumatic-tube- 3T. The lower end a of the latter is formed with a-threadpick-uphook 38 which extends downwardly-arid forwardly with respecttoa thread intake -mouth 39 at the bottom of tube 37. Thelatter is connected atits upperend -to a-hose4ll--which--leads toany convenient source of subatmospher-ic pressures.

The carrier C is formed preferably with a-laterally extending guide ii-having in the upper end thereof a guide slot Mi'defined by'the right and left hand walls: ii and itg respectively; see Fig. 3. Tube 35 normally rests in the lower end of slot 43 and the guide surfaces 81 and 3% permit thetube .to moveupwardly. in slot 46" with respect to-.the carrier '0. A collarde isxsecured to-the rigid tube 35 forwardly of'theguide 55 as shown in Fig. l, and a tension springL EEI:isoperatively interposed between thebottom of the guide-T45, as at and the collar,-as at -52. :The normal eifect of spring .dfi-is to holdthe intermediate part.

of the tube betweenlitsendsdown in theslotlfi.

. Asliding pivotal mountingis- --provided for'the forward end of.-the:.tube 35. as shown" morerparticularly in FigSLZ', 4iancl 5. 31 This mounting comprises a fitting as provided. with althreadedshank t l: preferably threaded intothe'. forwardpart-of the; flat ibody 22..of the carrier C. Alock :nutYGZJ holds .thefitting-p6G1;..tightly :to the CaIIlEIi'TC. Rockable withinithefittingififlzis asspherical bearingli SLDIOVidGd'WiT/h aicylindricalboresfi Bireceivbottom of a tube? ing the forward end of the tube 35. The bearing 65 can oscillate in the fitting 60 to permit angular movement of the rod 35 relatively to carrier C.

' A compression spring 61 is operatively interposed between the guide 45 and the bafille plate 36 and operates normally to hold the tube 35 in rearward s ti n i the .collar 14. a ai s hssu Norma1l,v. th e parts willbein the position shown in Fig 1 with the remover tube in its raised or .thread non-pick-up position. When the transferrer arm descends its stud ll enga es wing l8 and roclss the carrier C in a counter-clockwise direction, Fig. 1, thereby lowering the guide 45 and the spring to causes the tube 35 to move down. If 'th shuttle is properly placed the tube ,3 1; ar d the, ;ar parts of the remover will move to' a low thread pick-up position, see full lines :Fig.17,.in-mhich'the tongue or hook 338 will be partly embedded in a mass of deformable material 70, such as plush, secured to the lay below the path of theshuttle. thread 11 to be removed extends-across the plush "it; and as the lay recedes subsequent tio traiisfer the thread moved toward thehook and intake mouth, at

which'time subatmospheric pressures within the tube =31 will attractthethr'eadl It is to' be uriderstood that the thread has previously been cutin known mannerfromitheshuttle at a point adjacent to the delivery eye (not shown) "of the Shuttle S-and is thereforefreeltorespond "to pneumatic attraction.

.If the-shuttle-should beslightly misplaced the revoker arm-2e may not beje'ifective to preventto the shuttle or the" thread-remover, or tdbothj of-; these parts; but inthe present instance the tube 35 when tr king, thef 'shuttle' as indicated for instance in Fig -d will move upwardly relatively to the slot lG anclthe spring 58 willstretch.

In this connection it will be" understood that the transferrer arm exerts a positive force on the carrier G moving it to its pick-up position, see

dottedflines, -Fig.-6, but the 'tubef35, having the force of the transferreriarn'i transmitted to "it byresilient means; is able to remain in en gag ement with the shuttle -asthe car-rier continues .tdmove. =-If the remover is engaged by ZaJ-rnisplaced shuttle as-the-lay advances the spring filwill yield to-permittube 35 to slide forwardly in pivotal mounting-to. 'a ndspring 58 will stretch V to the dotted-line;position' shown'in Fig. 7. I

" While the chief} feature 'of the invention is ;to

preventbreakage of the thread remover in the event-that itstrikes a rnisplaced shuttle, itialsoj hasafurtheradvantage in that spring 50* can yield-slightly if fth parts are set so: thatthe i andthe hcok 39 should strike the top of-the layas the carrierC is 'mo'vedfby the transferrer ar-m to pick-up position. 1f the shuttle should be misplaced as} already stated and .preventfull; descent of the member- 3'5";to -pick-up position,--the rod-2i will restore the carrier-to its normal position at a later ti'me; whereupon:thespring5iirestores;the member -35 to thecbottom of' th'e- $101346 as -the"parts return tolno'rmahthreadnon-pick-up position.

:From the-foregoingit will be seen-that the invention -sate forth a carrier (2 which is positively moved by the transferrer arm; butis 'so formed as to .permitrelative:upward movement of: thezthread-remover-fi should the latter; strike d; When this has happened a misplaced shuttle. Carrier C is formed with a slide guide 45 for the elongated member 35 to permit upward movement of the latter relative to the carrier against the action of spring 50. If for any reason the shuttle S should be behind the thread remover when the latter reaches its low or thread pick-up position the remover will then be pushed forwardly by the misplaced shuttle to the position indicated in dotted lines in Fig. 7. The spring 50 will stretch and permit forward motion of the collar 49, but as soon as theilay moves rearwardly the spring will contract back-to its normal position relative to carrier C as shown in full lines in Fig. '7. It will also be seen that should the parts be set in such position that the bottom of tube 31 or hook 39 should touch the top of the lay as the transferrer arm approaches the lower limit of its motion the spring 50 will yield slightly to prevent damage of the thread remover.

Having thus described the invention it will be seen that changes and modifications of the foregoing specific disclosure may be made without departing from the spirit and scope of the invention.

What is claimed as new is:

1. In pneumatic thread remover mechanism for a loom havinga bobbin transferrer arm and a supporting stud therefor, a carrier mounted for angular movement on the stud and moved from normal positionjto pick-up position by the transferrer arm, s'a -thread remover including an elongated member, means mounting the member for pivotal movement with respect to the carrier, a guide for the member on the carrier capable of guiding the member for movement relatively to the carrier in a direction opposite to that in which the carrier moves when moving toward pick-up position, and resilient means normally holding the member in normal position with respect to the carrier but yielding to permit movement of the member relatively to the carrier in said opposite direction when the remover engages a misplaced shuttle as the carrier moves toward pick-up position. I

2. In pneumatic thread remover mechanism for a loom, a carrier movably mounted on the loom normally in thread non-pick-up position but moving in a given plane to thread pick-up position incident to a weft replenishing operation of the loom, a thread remover including an elongated member, a pivotal connection between the carrier and the member, a guide on the carrier constructed to permit pivotal motion of the member in said plane relative to the carrier, and means holding the member in normal position relatively to the carrier but permitting said pivotal motion of the member along said guide in the event that the remover engages a misplaced shuttle when the carrier moves to pick-up position.

3. In pneumatic thread remover mechanism for a loom, a carrier mounted on a loom for pivotal movement relatively thereto normally in thread non-pick-up position but moving pivotally to thread pick-up position incident to a weft replenishing operation 01' the loom, a thread remover including an elongated member, means mounting the member for relative angular movement with respect to the carrier, a guide on the carrier comprising spaced vertical Walls along which the member is slidable, and resilient means holding the member in normal position relative to said carrier but yielding to permit angular movement of the member relative to the carrier in the event that the thread remover strikes a misplaced shuttle when the carrier moves to thread pick-up position.

4. In pneumatic thread remover mechanism for a loom having a lay, a carrier mounted for movement with respect to the loom normally in thread non-pick-up position but moving to thread pick-up position on weft replenishing beats of the loom, a pneumatic thread remover above the lay including an elongated member, and a pivotal connection between the carrier and the member, the carrier having a vertically extending guide slot through which said member extends and in which said member is movable upwardly with respect to the carrier, said member tending to remain in the bottom of said guide slot and moving upwardly in said slot in the event that the remover strikes a misplaced shuttle when the carrier moves to pick-up position.

5. In pneumatic thread remover mechanism for a loom having a lay, a carrier normally in thread non-pick-up position but moving to thread pick-up position incident to a weft replenishing operation of the loom, a pneumatic thread remover including an elongated member, means interconnecting said member and carrier enabling said member to move pivotally and also slide relatively to the carrier, vertical guide means on the carrier along which the member is slidable relatively to the carrier, and resilient means holding said member normally at the bottom of said vertical guide means, said resilient means and carrier effective when the latter moves to thread pick-up position to move the remover downwardly toward the lay and the resilient means yielding to permit upward movement of said member with respect to said guide means in the event that the remover strikes a misplaced shuttle.

6. A carrier and pneumatic thread remover assembly for a weft replenishing loom, said assembly including a carrier adapted for attachment to the loom and including vertical guides, a remover including an elongated member, a pivotal connection between the carrier and member, and resilient means operatively connecting the carrier and member holding the latter in the normal position with respect to the carrier but enabling said member by yielding of the resilient means to move along said guides.

ALEXANDER. C. KRUKONIS.

REFERENCES CIQlED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,219,768 Darwin Oct. 29, 1940 2,432,157 Hooper et a1 Dec.. 9, 1947 2,520,580 Turner Aug. 29, 1950 

